LONDON -- The FTSE 100 (FTSEINDICES:^FTSE) has had a bit of a mixed week, dropping 39 points to 6,691 by the end of Thursday, after a few weak Christmas trading updates. But the index of top U.K. stocks recovered on Friday, to finish with a weekly gain of just 9 points.
Sentiment seems mildly positive, although it was tempered by slightly disappointing U.S. jobs figures.
Here are four of the week's biggest FTSE 100 movers.
Marks & Spencer (LSE:MKS)
Marks & Spencer surprised a few this week, with a 24.8 pence (5.6%) rise to 468.8 pence, even though the quarter to Dec. 28 brought in yet another fall in like-for-like clothing sales, with general merchandise down 2.1%.
But chief executive Marc Bolland blamed "an exceptionally unseasonal October" and highlighted a total general merchandise rise of 1.5% in the eight weeks to Christmas Eve. Overall group sales for the quarter gained 3.2%.
Housebuilder Persimmon continued its strong run, after an update ahead of full-year results told us of "a strong finish to the year." House sales during 2013 rose by 16% to 11,528, with a 4% increase in the average selling price to 180,900 pounds.
The stock price picked up 95 pence (7.5%) to 1,354 pence, taking it up around 55% over the past 12 months. There are further strong earnings rises forecast for 2014 and 2015.
Wm Morrison Supermarkets (LSE:MRW)
A disappointing Christmas trading update from Wm Morrison Supermarkets sent the company's stock crashing 22.1 pence (8.6%) this week, to 236.1 pence. Morrison, which has yet to offer online shopping to its customers, suffered from the omission in a period when rivals were seeing their online sales soar -- like-for-like sales in the six weeks to Jan. 5 fell 5.6%.
In partnership with Ocado, Internet sales should finally start this month, so maybe we'll see a better Christmas next year.
ARM Holdings (LSE:ARM)
ARM Holdings, the designer of chips that power Apple's iPhones and a range of other mobile devices, saw its stock climb by more than 25% in the year ending Dec. 31. But with the soaring price giving us a P/E of nearly 55 on full-year expectations, was that valuation a bit too high?
There was a bit of a correction this week after a broker downgrade, with the price dropping back 115 pence (10.6%) to close Friday at 972 pence -- that P/E is now down to a mere 47!
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Alan Oscroft has no position in any stocks mentioned. The Motley Fool recommends Morrisons. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.